2 * Copyright (c) 2000-2005 by Hewlett-Packard Company. All rights reserved.
4 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
5 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
7 * Permission is hereby granted to use or copy this program
8 * for any purpose, provided the above notices are retained on all copies.
9 * Permission to modify the code and to distribute modified code is granted,
10 * provided the above notices are retained, and a notice that the code was
11 * modified is included with the above copyright notice.
14 /* Included indirectly from a thread-library-specific file. */
15 /* This is the interface for thread-local allocation, whose */
16 /* implementation is mostly thread-library-independent. */
17 /* Here we describe only the interface that needs to be known */
18 /* and invoked from the thread support layer; the actual */
19 /* implementation also exports GC_malloc and friends, which */
20 /* are declared in gc.h. */
22 #include "private/gc_priv.h"
24 #if defined(THREAD_LOCAL_ALLOC)
26 #include "gc_inline.h"
29 # if defined USE_HPUX_TLS
30 # error USE_HPUX_TLS macro was replaced by USE_COMPILER_TLS
33 # if !defined(USE_PTHREAD_SPECIFIC) && !defined(USE_WIN32_SPECIFIC) && \
34 !defined(USE_WIN32_COMPILER_TLS) && !defined(USE_COMPILER_TLS) && \
35 !defined(USE_CUSTOM_SPECIFIC)
36 # if defined(MSWIN32) || defined(MSWINCE) || defined(CYGWIN32)
37 # if defined(__GNUC__) /* Fixed for versions past 2.95? */
38 # define USE_WIN32_SPECIFIC
40 # define USE_WIN32_COMPILER_TLS
42 # elif defined(LINUX) && !defined(ARM32) && \
43 (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >=3))
44 # define USE_COMPILER_TLS
45 # elif (defined(GC_DGUX386_THREADS) || defined(GC_OSF1_THREADS) || \
46 defined(GC_DARWIN_THREADS) || defined(GC_AIX_THREADS)) || \
47 defined(GC_NETBSD_THREADS)
48 # define USE_PTHREAD_SPECIFIC
49 # elif defined(GC_HPUX_THREADS)
51 # define USE_PTHREAD_SPECIFIC
52 /* Empirically, as of gcc 3.3, USE_COMPILER_TLS doesn't work. */
54 # define USE_COMPILER_TLS
57 # define USE_CUSTOM_SPECIFIC /* Use our own. */
63 /* One of these should be declared as the tlfs field in the */
64 /* structure pointed to by a GC_thread. */
65 typedef struct thread_local_freelists {
66 # ifdef THREAD_LOCAL_ALLOC
67 void * ptrfree_freelists[TINY_FREELISTS];
68 void * normal_freelists[TINY_FREELISTS];
69 # ifdef GC_GCJ_SUPPORT
70 void * gcj_freelists[TINY_FREELISTS];
71 # define ERROR_FL ((void *)(word)-1)
72 /* Value used for gcj_freelist[-1]; allocation is */
75 /* Free lists contain either a pointer or a small count */
76 /* reflecting the number of granules allocated at that */
78 /* 0 ==> thread-local allocation in use, free list */
80 /* > 0, <= DIRECT_GRANULES ==> Using global allocation, */
81 /* too few objects of this size have been */
82 /* allocated by this thread. */
83 /* >= HBLKSIZE => pointer to nonempty free list. */
84 /* > DIRECT_GRANULES, < HBLKSIZE ==> transition to */
85 /* local alloc, equivalent to 0. */
86 # define DIRECT_GRANULES (HBLKSIZE/GRANULE_BYTES)
87 /* Don't use local free lists for up to this much */
93 # if defined(USE_PTHREAD_SPECIFIC)
94 # define GC_getspecific pthread_getspecific
95 # define GC_setspecific pthread_setspecific
96 # define GC_key_create pthread_key_create
97 # define GC_remove_specific(key) /* No need for cleanup on exit. */
98 typedef pthread_key_t GC_key_t;
99 # elif defined(USE_COMPILER_TLS) || defined(USE_WIN32_COMPILER_TLS)
100 # define GC_getspecific(x) (x)
101 # define GC_setspecific(key, v) ((key) = (v), 0)
102 # define GC_key_create(key, d) 0
103 # define GC_remove_specific(key) /* No need for cleanup on exit. */
104 typedef void * GC_key_t;
105 # elif defined(USE_WIN32_SPECIFIC)
106 # include <windows.h>
107 # define GC_getspecific TlsGetValue
108 # define GC_setspecific(key, v) !TlsSetValue(key, v)
109 /* We assume 0 == success, msft does the opposite. */
110 # define GC_key_create(key, d) \
111 ((d) != 0? (ABORT("Destructor unsupported by TlsAlloc"),0) \
112 : ((*(key) = TlsAlloc()) == TLS_OUT_OF_INDEXES? \
113 (ABORT("Out of tls"), 0): \
115 # define GC_remove_specific(key) /* No need for cleanup on thread exit. */
116 /* Need TlsFree on process exit/detach ? */
117 typedef DWORD GC_key_t;
118 # elif defined(USE_CUSTOM_SPECIFIC)
119 # include "private/specific.h"
125 /* Each thread structure must be initialized. */
126 /* This call must be made from the new thread. */
127 /* Caller holds allocation lock. */
128 void GC_init_thread_local(GC_tlfs p);
130 /* Called when a thread is unregistered, or exits. */
131 /* We hold the allocator lock. */
132 void GC_destroy_thread_local(GC_tlfs p);
134 /* The thread support layer must arrange to mark thread-local */
135 /* free lists explicitly, since the link field is often */
136 /* invisible to the marker. It knows how to find all threads; */
137 /* we take care of an individual thread freelist structure. */
138 void GC_mark_thread_local_fls_for(GC_tlfs p);
141 #if defined(USE_COMPILER_TLS)
143 #elif defined(USE_WIN32_COMPILER_TLS)
146 GC_key_t GC_thread_key;
148 /* This is set up by the thread_local_alloc implementation. But the */
149 /* thread support layer calls GC_remove_specific(GC_thread_key) */
150 /* before a thread exits. */
151 /* And the thread support layer makes sure that GC_thread_key is traced,*/
154 #endif /* THREAD_LOCAL_ALLOC */